The six-hectare site, near Clipstone, has become a magnet for cycle fans who want to defy gravity and hone their jumping skills in what is the largest such attraction nearby.
The feature was originally conceived on a smaller scale three years ago to deter youngsters from building informal earthen jumps, which posed a potential threat to conservation and archaeological sites.
But rather than trying to outlaw such wild jumps the commission worked with local bikers to create a new propose built area.
Now this has been expanded and the complex revamped by world class mountain biker, Rowan Sorrel, part of a trail design team called Back on Tracks.
Forestry Commission recreation manager Chris Bray said the project has been worth every penny.
“The project has cost about £10,0000, but this is money well spent,” he said.
“The dirt jumping area has been a massive success and as well as providing a stunning experience for riders it has also brought lots of social benefits, giving youngsters a focus for their energies.”
“We hope to run workshops on dirt jump building and maintenance as well as skills sessions, all designed to help riders embrace the facility and claim a stake in its future.”
For further information on bike trails and facilities in Sherwood Pines go to www.forestry.gov.uk/EastMidlands